Mobile friendly filtering

Use modal + inline display for form filter mode

Other stuff:

• Don't fire rowclicks on cells with data-toggle=dropdown in them
• Use currency symbol for filter values instead of $
• Don't run setFilterMode logic if we're already in that mode
• Template footer summary
• Allow html in column caption

Breaking:

• Default initial filter mode is now Form
• BeforeRender/BeforeRenderThis renamed to OnBeforeRender/BeforeRender
• BeforeRender now executes on all grid renders instead of just the first one, with new bool param of whether it is first render